Touch panel device and method of correcting coordinates on touch panel
Active Publication Date: 2016-06-02
FUJITSU COMPONENENT LTD
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Benefits of technology
The present invention provides a touch panel device and method of correcting coordinates on a touch panel. This is achieved by approximating curves passing through the coordinates of reference points on the input surface, and specifying a region around an arbitrary point on the input surface. The method then calculates distances from the detected coordinates of the arbitrary point to the curves, and calculates corrected coordinates based on the location of the specified region and the distances to the curves. The technical effect is to improve the accuracy and efficiency of touch panel devices.
Problems solved by technology
The deviation of the detected input coordinates can be reduced by using electrodes having a low resistance value, but an overcurrent flows through an electronic component, such as a transistor coupled to the electrode, and thus may break it.
Furthermore, the use of an electronic component having a high pressure resistance is possible, but increases the cost of the touch panel device.
Method used
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[0024]The method disclosed in Patent Document 1 corrects input coordinates on a touch panel with first-order polynomial equations. Thus, when equipotential lines get curvilinearly distorted as with in a four-wire or five-wire touch panel having an anomalous external shape (e.g., a circular shape), the input coordinates cannot be corrected with high accuracy. Patent Document 2 discloses a method of correcting input coordinates on a touch panel with first order and second order polynomial equations, but performs a complicated multiple-stage approximation process. Thus it needs not only a great deal of processing time but also massive hardware including a high-capacity memory.
[0025]FIG. 1 is a configuration diagram of an exemplary touch panel device. The touch panel device includes a touch panel 100A, 100B, a display 101, and a control device 6. The touch panel 100A, 100B is, for example, a four-wire or five-wire touch panel.
[0026]The display 101 is, for example, a liquid-crystal displ...
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A touch panel device includes: a detection unit that detects coordinates of a pressed point on an input surface of a touch panel; and a correction unit that corrects the coordinates detected by the detection unit to obtain corrected coordinates, wherein the correction unit approximates, when a predetermined number of reference points arranged on the input surface are pressed, curves passing through coordinates of the reference points by second order or higher order polynomial equations, specifies, when an arbitrary point on the input surface is pressed, a region including coordinates of the arbitrary point from regions obtained by dividing the input surface by the curves, calculates distances from the coordinates of the arbitrary point to curves that define the specified region among the curves with the second order or higher order polynomial equations, and calculates the corrected coordinates based on a location of the specified region and the distances.
Description
CROSS-REFERENCE TO RELATED APPLICATION[0001]This application is based upon and claims the benefit of priority of the prior Japanese Patent Application No. 2014-244372 filed on Dec. 2, 2014, the entire contents of which are incorporated herein by reference.FIELD[0002]A certain aspect of the embodiments is related to a touch panel device and a method of correcting coordinates on a touch panel.BACKGROUND[0003]The diffusion of mobile electronic devices such as tablet terminal devices and portable game devices leads to wide use of touch panels that detect input coordinates in the display screen. A four-wire or five-wire resistive touch panel detects input coordinates based on the electric potential of the resistance film corresponding to a pressed point on the input surface of the touch panel.[0004]The detected input coordinates, however, have deviations from the actual coordinates of the pressed point because the equipotential lines in the resistance film are curvilinearly distorted due...
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Login to View More IPC IPC(8): G06F3/045G06F3/041
CPCG06F3/0418G06F3/045G06F3/04186
InventorHAGIHARA, HIDEYUKIMAKIUCHI, YUJI
OwnerFUJITSU COMPONENENT LTD